Icalendar

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Bug fixes:

- to_ical() now accepts RRULE BYDAY values>=10 518

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Minor changes:

- Adjusted duration regex

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Minor changes:

- Added support for BYWEEKDAY in vRecur ref: 268

Bug fixes:

- Fix problem with ORGANIZER in FREE/BUSY 348

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Minor changes:

- Improved documentation
Ref: 503, 504

Bug fixes:

- vBoolean can now be used as an parameter
Ref: 501
Fixes: 500
[jacadzaca]

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New features:

- vDDDTypes is hashable 487 492 [niccokunzmann]

Bug fixes:

- vDDDTypes' equality also checks the dt attribute 497 492 [niccokunzmann]

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Minor changes:

- Refactored cal.py, tools.py and completed remaining minimal refactoring in parser.py. Ref: 481 [pronoym99]
- Calendar.from_ical no longer throws long errors
Ref: 473
Fixes: 472
[jacadzaca]
- Make datetime value shorter by removing the value parameter where possible.
Fixes: 318
[jacadzaca], [niccokunzmann]

New features:

- source code in documentation is tested using doctest 445 [niccokunzmann]

Bug fixes:

- broken properties are not added to the parent component
Ref: 471
Fixes: 464
[jacadzaca]